1289387263 has 2 divisors, whose sum is σ = 1289387264. Its totient is φ = 1289387262.

The previous prime is 1289387249. The next prime is 1289387273. The reversal of 1289387263 is 3627839821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1289387263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1289387243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644693631 + 644693632.

It is an arithmetic number, because the mean of its divisors is an integer number (644693632).

Almost surely, 2^1289387263 is an apocalyptic number.

1289387263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289387263 is an equidigital number, since it uses as much as digits as its factorization.

1289387263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The square root of 1289387263 is about 35908.0389745806. The cubic root of 1289387263 is about 1088.4148501681.

The spelling of 1289387263 in words is "one billion, two hundred eighty-nine million, three hundred eighty-seven thousand, two hundred sixty-three".